麦草浆黑液燃烧法除硅研究

Remove silicon through black liquor combustion for wheat straw pulping

研究了硫酸铝对麦草浆浓黑液理化性能及除硅效果的影响.实验结果表明,铝盐有利于提高浓黑液膨胀率,在添加量为3%时达到了最大值64.19%;流变仪检测表明,在高温下铝盐添加量对浓黑液的黏度几乎没有影响,可在110℃输送浓黑液;黑液燃烧法结果表明,铝盐具有一定的除硅作用,硫酸铝的除硅效果最高可达53.02%;SEM-EDAX检测结果表明,铝离子能和硅形成不溶于水的沉淀物.上述结果表明:硫酸铝具有一定的除硅效果,当其添加量为3%时除硅效果最好.

Effect of physical and chemical properties and desilication rate of aluminium sulphate were studied on thick black liquor of grows wheat straw.Results showed that expansion rate was enhanced with an increase in aluminum salt which reached the maximum desilication rate of 64.19% in addition amount of 3%.Rheometer showed aluminum salt would have little impact on the viscosity of thick black liquor at a high temperature,so it was a better selection that thick black liquor could be conveyed at 110 ℃.It was studied the effect of adding aluminium salt on silicon removal rate during black liquor combusting.The experimental results showed that aluminium sulphate had the function of desilication,while the desilication rate of aluminum sulphate could reach 53.02%.SEM-EDX illustrated the aluminum and silicon ions was formed into insoluble precipitate.It was a optimum way to choose 3% of aluminium sulphate as the desilication agent under comprehensive consideration.